Abstract
At the end of June, 1957, while studying nesting yellow-bellied sapsuckers ( Sphyrapicus v. varius ) in Tamworth, New Hampshire, I had opportunities to watch red squirrels ( Tamiascirus hudsonicus ) feeding at sapsucker holes in gray birches ( Betula populifolia ). The sapsuckers continually revisited a relatively few trees to obtain sap for their young. These trees happened to be predominantly gray birches. Sapsuckers might visit their best trees every 2 to 4 minutes and one pair had two such birches only 15 feet apart. On June 21, a red squirrel ran up to the band of holes on one birch, lapped vigorously, then ran over to feed on the second one, finally returning to lap again on the first tree. Such visits were observed daily for one week. The earliest visit …
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